diff --git a/crates/ide_db/src/helpers/format_string.rs b/crates/ide_db/src/helpers/format_string.rs
index 29f61a95e7..3c584a6cbc 100644
--- a/crates/ide_db/src/helpers/format_string.rs
+++ b/crates/ide_db/src/helpers/format_string.rs
@@ -13,7 +13,6 @@ pub fn is_format_string(string: &ast::String) -> bool {
     //
     // This setup lets us correctly highlight the components of `concat!("{}", "bla")` format
     // strings. It still fails for `concat!("{", "}")`, but that is rare.
-    format!("{string} {bar}", bar = string);
     (|| {
         let macro_call = string.syntax().ancestors().find_map(ast::MacroCall::cast)?;
         let name = macro_call.path()?.segment()?.name_ref()?;